Malicious PDF — malware analysis report

Static analysis result for SHA-256 790ea0516e113ce0…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 17:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1540d1a8b71817f990b885f97ce0f60f SHA-1: b1e1eb2b311d3fd3ca22ca57930dc957c03bc698 SHA-256: 790ea0516e113ce0fad1571790fdcaa3f56977e3942bf4d15ed9f096eb2450a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for SEO manipulation or to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://impressivetravelvietnam.com/upload/files/97155770671.pdf In PDF document text
    • http://icbiz.ru/userfiles/file/76397175376.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/41246265961.pdfIn PDF document text
    • http://millecolori.it/images/file/tajesiviwexikaxomamata.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/zinuvinorerirovalofe.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/34035027598.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/51058725282.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613264caec1e7---givuzimapofibiral.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0908/7575094f004685b8077f8d72e2694240.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/wajapugunazerunidajiguro.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/zejise.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/buzarinurovomilajaloka.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/1241964950.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/25062098280.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334d962bf4---fetidogegadepetunib.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/worekigodexavow.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613165a667155---58762365192.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/zoxifawe.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/96173879340.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/3344474009.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/zujipolobatoxemiko.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613efbc35ff71---legibutituwuxanem.pdfIn PDF document text
    • http://harlit.com/upfiles/file/65318899201In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=website+to+apk+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 10428 bytes
SHA-256: 561ee3b969f34a13daf3c2b452285aa42d67e5079f8f69662986d7a10d532a68
font_01_sfnt_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 17740 bytes
SHA-256: bc5b367ff5e27ed106a4bade393e65a0c87f21232d6002cd090a766fbead97ae
font_03_sfnt_off00012e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E41 17272 bytes
SHA-256: 0b26e2b1dc1e2e63b823e913c9067d7a6e0ee737069fc8e0d1108f24df40a3f8

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